CN107290773B - A kind of device and method of spectral measurement - Google Patents
A kind of device and method of spectral measurement Download PDFInfo
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- CN107290773B CN107290773B CN201710641908.4A CN201710641908A CN107290773B CN 107290773 B CN107290773 B CN 107290773B CN 201710641908 A CN201710641908 A CN 201710641908A CN 107290773 B CN107290773 B CN 107290773B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/36—Measuring spectral distribution of X-rays or of nuclear radiation spectrometry
- G01T1/362—Measuring spectral distribution of X-rays or of nuclear radiation spectrometry with scintillation detectors
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Abstract
The present invention relates to mine field of detecting.Purpose is to provide a kind of device and method of spectral measurement, which includes top electronics element cell and lower part probe chamber.Handle is housed, the lower part probe chamber enclosed inside has main detector, and multiple anticoincidence detectors are arranged in main detector periphery, and multiple anticoincidence detector outer layer designs have shielded layer, and the shielded layer outer layer designs protective layer at the top of the top electronics element cell.The main detector and anticoincidence detector include scintillation crystal, optocoupler zoarium, photodiode, spectrum stabilization circuit, pre-amplification circuit and bias power supply circuit.The spectrum stabilization circuit is made of current monitoring part and temperature sensing part, includes rechargeable battery, power-switching circuit, summing circuit, anticoincidence circuit and multi-channel analysis circuit inside the electronics element cell.In conjunction with the structure and spectrum stabilization method of the device, so that the present invention has the advantages that small in size, spectrum drift is small, charging is convenient.
Description
Technical field
The present invention relates to mine field of detecting, particularly relate to a kind of device and method of spectral measurement.
Background technique
Spectral measurement is a particularly significant and common technological means in uranium exploration industry, and conventional energy disperse spectroscopy
Crystal generally cooperate photomultiplier tube use.But the gain of photomultiplier tube can be by shadows such as voltage stability, earth magnetism, temperature
Ring and serious drift occur, and photomultiplier tube and crystal are fragile parts, volume is again larger, inconvenience using screw or other
Mechanical means is too tightly isobaric, and intermediate tie is obtained and bad have to be optically coupled with silicone oil.It is jolted in long-distance transport and field
Under, slight change, which occurs, for intermediate gap will cause serious spectrum drift.Although geomagnetic shielding, hardware circuit spectrum stabilization are to a certain degree
On can improve spectrum drift, but actual effect still can have certain spectrum drift." software based on each measurement again energy calibration
Spectrum stabilization " technology but will fail when spectrum drift is serious.
Also there is the survey meter using crystal cooperation photoelectric diode structure on small-sized low precision energy disperse spectroscopy, uses photoelectricity two
Pole pipe can greatly reduce energy disperse spectroscopy volume, but the resolution ratio photomultiplier tube of photodiode is far short of what is expected, Er Qieguang
The parameters such as breakdown reverse voltage, the reverse leakage current of electric diode are influenced by temperature very greatly, can be generated to energy disperse spectroscopy serious
Compose drift problem.And the field detection time is generally up to the several months, and in detection, the continuous electric problem of energy disperse spectroscopy, is not to carry out battery
Replacement, exactly charged using other charging equipments.Additional device is carried to detection personnel and increases more bear
Load.
Summary of the invention
In view of this, a kind of device and method of spectral measurement provided by the invention, the device and method of the spectral measurement
Have the advantages that volume and spectrum drift are small.
For achieving the above object, a technical solution of the present invention is: a kind of device of spectral measurement, packet
Top electronics element cell and lower part probe chamber are included, the lower part probe chamber enclosed inside has main detector, main detection
Multiple anticoincidence detectors are arranged in device periphery, and multiple anticoincidence detector outer layer designs have shielded layer；
The shielded layer outer layer design has protective layer, and generator, the generator output end is arranged inside the protective layer
It being connect with electronics element cell, the generator bearing is fixedly connected with two wheels that protective layer front panel bottom surface is arranged,
Rotor is fixedly mounted in the bearing middle-end, and magnet is arranged in the rotor radial periphery；
The main detector and anticoincidence detector include scintillation crystal, and shape is posted as cone in the scintillation crystal top surface
The optocoupler of body is fit, and photodiode is posted in the side of optocoupler zoarium, the photodiode respectively with spectrum stabilization circuit and inclined
Power circuit connection is set, the spectrum stabilization circuit includes current monitoring part and temperature sensing part, and the current monitoring part is defeated
Enter end to connect with photodiode, the multi-channel analysis circuit connection of current monitoring part output end and electronics element cell,
The temperature sensing part monitors scintillation crystal temperature, the multi-channel analysis electricity of temperature sensing part output end and electronics element cell
Road connection, the multi-channel analysis circuit of electronics element cell are connect with bias power supply circuit pressure feedback port.
Preferably, the main detector is cube, and 4 shapes are that the anticoincidence detector of cuboid is mutually spliced to form
Intersecting parallels structure.
Preferably, the shielded layer is made of with wolfram steel or lead with wolfram steel double-layer structure fine copper, the protective layer leading flank
Pull rod is arranged in plate top surface.
Preferably, the scintillation crystal of the main detector uses LaBr3 ︰ Ce crystal or CsI:Tl crystal, the anticoincidence
The CsI:Tl crystal that the scintillation crystal of detector uses with a thickness of 4cm.
Preferably, the optocoupler zoarium in the main detector and the input terminal of nine photodiodes are connected in parallel, described
Optocoupler zoarium in anticoincidence detector is connect with the input terminal of a photodiode.
Preferably, the photodiode output end is also connect with pre-amplification circuit input terminal, the photodiode
Number it is identical as the number of pre-amplification circuit, bias power supply circuit.
Preferably, the top electronics element cell top surface is equipped with handle, further include inside the electronics element cell with
The power-switching circuit of rechargeable battery output end connection, and exported by the pre-amplification circuit of line between plate and probe chamber
Hold the summing circuit of connection, the summing circuit output end connect with anticoincidence circuit, the anticoincidence circuit output end with it is more
Trace analysis circuit connection.
For achieving the above object, another technical solution of the present invention is: providing a kind of spectral measurement
The spectrum stabilization method of device, comprising the following steps:
(1) pass through the reverse leakage current of current monitoring part monitor photodiode；
(2) reverse leakage current monitored is output to multi-channel analysis circuit by current monitoring part；
(3) reverse leakage current finely tunes the output voltage of each bias power supply circuit to multi-channel analysis circuit based on the received, often
The input voltage changing value control reverse leakage current average value of a photodiode is consistent；
(4) temperature of temperature sensing part monitoring scintillation crystal, and it is sent to multi-channel analysis circuit；
(5) the multi-channel analysis circuit uses formula according to the temperature information received: y=0.0567x-1.394, meter
The trim values of each bias power supply circuit output voltage are calculated, wherein y is the trim values of bias power supply circuit output voltage, and x is
Temperature.
The invention has the following advantages: in the inventive solutions, because substituting light using photodiode
Electric multiplier tube effectively reduces the volume and weight of spectral measurement device as optical read-out device.Meanwhile passing through temperature sensing part
Detection scintillation crystal temperature is sent to multi-channel analysis circuit, and temperature information calculates biased electrical to multi-channel analysis circuit based on the received
The output voltage of source circuit presses trim values, makes photodiode under different temperatures environment, the pressurization being consistent overcomes whole
The spectrum of a probe is floated.And the reverse leakage current of every photodiode of current monitoring part monitors, Real-time Feedback trim voltage make
Under the conditions of different temperatures, different counting rates, average drain currents are consistent every photodiode.Pass through temperature sensing part
It is cooperated with each other with current monitoring part, so that the present invention has the advantages that spectrum drift is small.
Because generator is arranged inside protective layer, the generator bearing and two with the setting of protective layer front panel bottom surface
A wheel is fixedly connected, and rotor is fixedly mounted in the bearing middle-end.When apparatus of the present invention are mobile, two wheels, which will do it, to be turned
It is dynamic, and then rotated with dynamic bearing, the rotor on the bearing also can be rotated together and then, and the rotor rotates in magnet
So that magnetic flux is changed and generate induced electromotive force in coil, the induced electromotive force is transmitted to electronics unit by electric wire
The rechargeable battery of room not only solves field charging problems, also saves cost.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is A-A direction view in Fig. 1；
Fig. 3 is generator rotor structure schematic diagram；
Fig. 4 is generator general structure schematic diagram；
Fig. 5 is the structural schematic diagram of main detector and anticoincidence detector；
Fig. 6 is main detector spectrum stabilization flow chart；
Fig. 7 is anticoincidence detector spectrum stabilization flow chart；
Fig. 8 is summing circuit schematic diagram of the invention；
Fig. 9 is anti-Compton measurement flow chart；
Figure 10 is work flow diagram of the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that the described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Based on this
Embodiment in invention, every other reality obtained by those of ordinary skill in the art without making creative efforts
Example is applied, shall fall within the protection scope of the present invention.
As shown in Figs. 1-2, a kind of device of spectral measurement be upper and lower two parts, including top electronics element cell 3 with
And lower part probe chamber.3 top surface of top electronics element cell is equipped with handle 4, is packaged with master in the lower part probe chamber
Detector 1 and multiple anticoincidence detectors 2, the main detector 1 are the part inside the probe chamber of lower part, under main detector 1
End design has window 6, and 1 peripheral part of main detector is then multiple anticoincidence detectors 2, and multiple 2 outer layers of anticoincidence detector are then
For shielded layer 5,5 outer layer of shielded layer is then protective layer 7, and the 7 front panel top surface of protective layer is provided with pull rod 9, front side
There are two wheels 8 for the setting of panel bottom surface.
The rechargeable battery of the electronics element cell 3 including rated output 7.2V voltage, the rechargeable battery output end with
Power-switching circuit connection, the power-switching circuit include using the booster circuit of Switching Power Supply scheme, reduction voltage circuit and anti-
Translation circuit is pressed, the power-switching circuit provides required voltage for each section circuit of the present apparatus.The reduction voltage circuit uses
LT3480 chip obtains+3.3V and+5V logic power, and+5V logic power filters acquisition+5V analog power by further,
It, which exports electric current, can achieve 2A, and working efficiency can reach 80% or more.The back-pressure translation circuit uses MAX764 chip, and
The circuit output is -5V, it is possible to provide the up to power of 1.5W.The booster circuit use MAX761 chip, output voltage be+
12V provides the output electric current of 150mA, and transfer efficiency is up to 90% or so, which also provides battery capacity deficiency detection electricity
Road, cooperated with LED driving circuit provide battery capacity instruction function.Power-switching circuit high conversion efficiency used in the present invention,
So that battery life is greater than 9 hours.Electronics element cell 3 further includes summing circuit, anticoincidence circuit and multi-channel analysis
Circuit, multiple pre-amplification circuit output ends of line and probe chamber connect respectively between the summing circuit input terminal passes through plate
It connects, the input terminal connection of the summing circuit output end and anticoincidence circuit, the output end and multiple tracks point of the anticoincidence circuit
Circuit connection is analysed, the multi-channel analysis circuit is connect with spectrum stabilization circuit and palm display unit respectively.
It is more convenient that the effect of the handle 4 can be such that staff carries, and handle 4 and electronics element cell 3 can be one
Structure, can also be fixed by screw and similar approach is mounted on electronics element cell 3.The shielded layer 5, to take into account machinery
Performance and shield effectiveness, the shielded layer 5 are combined with two layers of wolfram steel with wolfram steel double-layer structure or lead by high purity copper and are formed, and effect is
Outer rays are reduced to enter anticoincidence detector 2 and vacation is caused to meet event.The effect of window 6 comes from main detector for detection
The gamma ray of 1 lower section and natural ray.The protective layer 7 is made of lead material, and environment sheet is effectively reduced in the protective layer 7
The radioactive influence in bottom shortens time of measuring under the premise of guaranteeing precision, realizes quickly analysis, and set inside protective layer 7
It is equipped with generator, additionally it is possible to charge, solve of the invention when field detects for a long time for the rechargeable battery of electronics element cell 3
The charging problems of device.The pull rod 9 has Telescopic, when apparatus of the present invention are mobile, by pull rod 9 from 7 leading flank of protective layer
It is stretched in plate, facilitates dragging.When apparatus of the present invention do not need to be moved, pull rod 9 is zoomed into 7 front panel of protective layer
In.
As shown in Figure 3-4, the bearing 14 for the generator being arranged inside the protective layer 7 is fixedly connected with two wheels 8, institute
It states 14 middle-end of bearing and is fixedly installed with rotor 13,13 radial outside of rotor is provided with magnet 15.Apparatus of the present invention are in movement
When, the wheel 8 will do it rotation, and then be rotated with dynamic bearing 14, and the rotor 13 on the bearing 14 can also follow one
Rotation is played, the rotor 13 rotates in magnet 15 to be made magnetic flux change and generate induced electromotive force in coil, the sense
It answers electromotive force to be transmitted to the rechargeable battery of electronics element cell 3 by electric wire, charging effect is carried out to the rechargeable battery.This hair
The generator of bright device does not need additional manpower or material resources, can charge to apparatus of the present invention during traveling
Effect, not only solves field charging problems, also saves cost.
As shown in figure 5, the main detector 1 includes scintillation crystal 10, optocoupler zoarium 11, light with anticoincidence detector 2
Read-out system 12, the optical read-out system 12 include photodiode, spectrum stabilization circuit, pre-amplification circuit and bias supply electricity
Road, and photodiode, spectrum stabilization circuit, pre-amplification circuit and bias power supply circuit are produced on one piece of pcb board.The sudden strain of a muscle
Post the optocoupler zoarium 11 that the shape that floor space matches with scintillation crystal top area is cone in bright 10 top surface of crystal；Optocoupler is fit
Photodiode is posted in 11 side, and the lateral area of optocoupler zoarium 11 matches with multiple photodiodes；The photoelectricity two
Pole pipe output end is connect with spectrum stabilization circuit, pre-amplification circuit respectively, photodiode bias voltage input end and bias supply
Circuit output end connection.
The gamma ray detected and natural ray are converted to photoelectron by the scintillation crystal 10.The main detector
1 scintillation crystal 10 uses LaBr3 ︰ Ce crystal or CsI:Tl crystal, and main detector 1 is using LaBr3 ︰ Ce in the present embodiment
Crystal can make survey meter energy resolution less than 4% (1760KeV of uranium).The scintillation crystal 10 of the anticoincidence detector 2 is adopted
With the CsI:Tl crystal with a thickness of 4cm.The optocoupler zoarium 11 couples photoelectron on photodiode, and optocoupler zoarium 11 makes
It is up to 94% acrylic material with high transparency material, such as light transmittance, improves photoelectronic collection efficiency.
After the photodiode receives incident photoelectron, generation " electron-hole " is right, and then output current signal,
The current signal of output is directly proportional to incident photon.The main detector 1 uses multiple photodiodes, effective in order to improve
Photoelectron receiving area is to improve energy resolution, and the present embodiment main detector 1 uses 9 photodiodes, surveys
It is 3.76% (1460keV of K-40) to energy resolution, the resolution ratio to Cs-137 is 5.5%.It is connect with photodiode
The number of pre-amplification circuit and the number of photodiode are identical.The photodiode that the anticoincidence detector 2 uses
Number is at least one, and the photodiode number that the present embodiment anticoincidence detector 2 uses is 1, therefore corresponding preceding storing
The number of big circuit is also 1.
In conjunction with shown in Fig. 6-7, the spectrum stabilization circuit is made of current monitoring part and temperature sensing part, the electric current
Monitoring part input terminal is connect with photodiode, the multiple tracks point of current monitoring part output end and electronics element cell 3
Circuit connection is analysed, the temperature sensing part monitors 10 temperature of scintillation crystal, temperature sensing part output end and electronics unit
The multi-channel analysis circuit connection of room 3, the multi-channel analysis circuit and bias power supply circuit pressure feedback port of electronics element cell 3 connect
It connects.
The method of the spectrum stabilization circuit are as follows: current monitoring part and temperature detection part complement each other and work at the same time, with
Have the function that spectrum stabilization.Wherein, the reverse leakage current of each photodiode of current monitoring part monitors, the current monitoring portion
Divide and be mainly made of current-voltage amplifier, the INA260 amplifier of TI can be used.Current monitoring part monitors the t1 moment
Reverse leakage current be output to multi-channel analysis circuit, the reverse leakage current of t1 reception is passed through AD conversion by multi-channel analysis circuit
It for digital signal and is saved in memory, when multi-channel analysis circuit receives next t2 moment current monitoring part transmission
When reverse leakage current, multi-channel analysis circuit can compare the reverse leakage current of t2 reception and the reverse leakage current at t1 moment
Compared with, can be by each bias power supply circuit when the reverse leakage current of the reverse leakage current of t2 reception ratio t1 reception is big
Output voltage turn down；It, can will be each when the reverse leakage current of the reverse leakage current of t2 reception ratio t1 reception is small
The output voltage of bias power supply circuit tunes up.Photodiode input offset voltage is finely tuned by Real-time Feedback reverse leakage current,
Make each photodiode under the conditions of different temperatures, different counting rates, average drain currents are consistent.Guarantee each photoelectricity two
Pole pipe is not influenced by temperature, so that the present invention composes drift very little.
Temperature detection part is mainly made of temperature sensor, detects 10 temperature of scintillation crystal, institute by temperature sensor
It states the temperature transition that temperature sensor will test and is sent to multi-channel analysis circuit at voltage value, multi-channel analysis circuit is according to temperature
Degree, voltage response finely tune the voltage value of each photodiode voltage, make photodiode under different temperatures environment,
The pressurization being consistent, the temperature of photodiode, voltage response are in linear relation, by formula y=0.0567x-1.394
It indicates, y represents the trim voltage value of voltage in formula, and unit V, x are temperature, unit DEG C.Table 1 is temperature detection part to not
Synthermal actual characteristic test value and design characteristics calculated value.
Table 1
| T(℃) | Δ HV measured value (V) | Δ HV design value (V) |
| 3.8 | -1.176 | -1.179 |
| 4.5 | -1.130 | -1.139 |
| 5.0 | -1.104 | -1.111 |
| 6.0 | -1.048 | -1.054 |
| 9.9 | -0.832 | -0.833 |
| 15.0 | -0.570 | -0.544 |
| 24.8 | 0.022 | 0.011 |
| 26.5 | 0.128 | 0.108 |
| 28.0 | 0.200 | 0.193 |
| 32.0 | 0.425 | 0.419 |
By data in table as it can be seen that the output of circuit meets desired design value, linear fit, fitting side are carried out according to measured value
Journey are as follows: y1=0.0569x1-1.3928.Measured value fit equation slope and design value equation slope difference are 0.35%, and are cut
Away from difference only influence the absolute value of spectral line peak position, spectrum drift is had no effect on, so can effectively solve temperature to photodiode band
The influence come, to solve the problems, such as that spectrum drift is larger.Using spectrum stabilization method of the invention make the spectrum stabilization performance of photodiode with
The same magnitude is in using the conventional energy disperse spectroscopy of photomultiplier tube, about ± 0.5/DEG C.
The bias power supply circuit provides required bias voltage for photodiode, and photodiode needs independent supply
Electricity, therefore the quantity of photodiode is as the quantity of bias power supply circuit.Bias power supply circuit of the present invention uses integrated boost
The mode of type Switching Power Supply combination charge pump, the present embodiment power supply chip use LT3482 scheme, and Linear public affairs can also be used certainly
Other IC products of department, such as LT3571.By power supply chip described in actual test may be implemented output area covering 60~
80V, Ripple Noise is less than 5mV, if Ripple Noise is unsatisfactory for requirement and can be further decreased by adding what RC filter circuit
Noise, so that bias power supply circuit output voltage stability is high, Ripple Noise is low, high conversion efficiency.The bias power supply circuit
The area of pcb board is suitable with a mao coin area, and the bias power supply circuit is succinctly small and exquisite, is greatly reduced this hair
Bright volume and weight.
The pre-amplification circuit is the fast current amplification circuit of an encapsulation on the photodiode, by photodiode
The current signal of output amplifies processing.As shown in figure 8, the summing circuit of the electronics element cell 3 will be by before multiple
Put big circuit output pulse signal carry out summation process, the output end of multiple pre-amplification circuits respectively with summing circuit
Multiple input channels connect, and summing circuit only draws tetra- input channels of I1-I4 in the present embodiment, and four pre-amplification circuits are defeated
Four pulse signals out pass through tetra- input channels of I1-I4 respectively and enter in operational amplifier U1A, pass through operational amplifier
U1A is exported after carrying out summation process by channel O1, and the input channel of summing circuit is determined according to actual photodiode number
Number, as the main detector 1 of the present embodiment uses 9 photodiodes, the then input for the summing circuit connecting with main detector 1
Number of active lanes is 9, and the anticoincidence detector 2 of the present embodiment uses 1 photodiode, therefore does not need to sum
Processing.
The anticoincidence circuit and multi-channel analysis circuit production of the electronics element cell 3 not only subtract on one piece of circuit board
Circuitry plate quantity is lacked and has reduced line between plate, while having avoided between plate that the mutual of device does on line and circuit board
It disturbs, improves circuit level and circuit reliability.The anticoincidence circuit with CPLD (Complex programmable logical device) be core, it is additional
Adjustable delay unit and signal width adjustment unit.The Complex programmable logical device is logic circuit, for realizing anti-Compton
Measurement, as shown in figure 9, i.e. only main detector 1 detects signal, and any one of multiple anticoincidence detectors 2 do not detect
To signal, it is to exclude Compton effect that just output one, which receives signal in signal notice multi-channel analysis circuit moment main detector 1,
It should be with the signal of photon escape.The effect of the adjustable delay unit is to eliminate each detector time difference problem, and the signal is wide
Adjustment unit effect is spent to adjust each detector output signal pulsewidth, to meet the requirement of anti-health measurement.The multi-channel analysis electricity
Road uses arm processor, while also including quasi- Gauss integration circuit, and the quasi- Gauss integration circuit uses 3 grades of Second Order Integral electricity
What road was realized, anticoincidence circuit output signal is formed using quasi- Gauss integration shaping circuit after satisfaction meets the requirements, with
Solve the high-frequency noise being superimposed in the asymmetrical characteristic and signal of the signal.The quasi- Gauss integration circuit output of arm processor
Digital signal is handled, and measurement spectral line is accumulated as, and the spectral line of acquisition is divided into the spectral line after original spectral line and anticoincidence by ARM,
The information that record is met to event simultaneously, in time of measuring, ARM is periodically to palm display unit transmission measurement spectral line.Anti- symbol
It closes circuit and multi-channel analysis circuit can effective suppression circuit noise, cosmic-ray background, effectively inhibition atmosphere and ambient enviroment gamma
Background, effectively inhibition Compton scattering ray, 20 to 60 times lower than the background of conventional spectrometer.
Preferably, a kind of basic structure of the device of spectral measurement is that main detector 1 is nested anti-into " well " type
Meet detector 2, a kind of shape of the device and method of spectral measurement of the present embodiment is cuboid, and main detector 1 is cube
Body or cuboid, 4 shapes are that the anticoincidence detector 2 of cuboid is mutually spliced into intersecting parallels structure.
Preferably, a kind of shape of the device of spectral measurement can also be that cylindrical body, main detector 1 can be cylinder
Shape, multiple anticoincidence detectors 2 are spliced into the annular structure matched with main detector 1, and so-called match refers to main detection
Device 1 can just be put into the annular structure that multiple anticoincidence detectors 2 form.
In conjunction with shown in Fig. 1-10, using spectral measurement of the present invention device detection method for example: the present invention was using
Cheng Zhong, incident photon first passes around window 6 and receives and generate photon by the scintillation crystal in main detector 1, while passing through main spy
The optocoupler zoarium surveyed in device 1 is coupled in 9 photodiodes and passes through 9 channel pre-amplification circuit output pulse signals, asks
Summation process is carried out to output pulse signal with circuit.The higher photon of energy will also enter multiple anticoincidence and visit in incident photon
It surveys and is coupled in photodiode in device 2 by optocoupler zoarium and passes through pre-amplification circuit output pulse signal；Then, anti-symbol
The pulse for the pulse signal and the output of multiple anticoincidence detectors 2 that the summing circuit of main detector 1 exports will be believed by closing circuit
Number coincidence measurement is carried out, because of the higher incident photon of the energy output pulse letter in main detector 1 and anticoincidence detector 2 simultaneously
Number, therefore be unsatisfactory for meeting the requirements, it will the higher incident photon of energy is masked, because the lower incident photon of energy can only lead to
1 output pulse signal of main detector is crossed, satisfaction meets the requirements；Subsequently, satisfactory output pulse signal is passed through quasi- high
This integral shaping circuit is formed, and is recently entered multi-channel analysis circuit and is analyzed and processed, in time of measuring, multiple tracks point
Circuit timing is analysed to palm display unit transmission measurement spectral line, meanwhile, the current monitoring part of spectrum stabilization circuit and temperature detection
Part, respectively to the leakage current of multi-channel analysis circuit transmission photodiode and the temperature of scintillation crystal 10.Multi-channel analysis electricity
Road is according to the output voltage of leakage current and temperature real-time control bias power supply circuit.
The present invention is based on more photodiodes, Multi probe meet it is effective with the noise of anticoincidence and background ray suppressing method
Inhibit the noise of optical read-out device, effectively inhibits cosmic-ray background, effectively inhibits atmosphere and ambient enviroment gamma background, effectively suppression
Compton scattering ray processed, so that the sensitivity and high resolution of instrument；Along with the higher detection efficient type of selection
LaBr3 ︰ Ce crystal further increases the sensitivity of instrument with resolution ratio；Selection is able to achieve using multi-detector united mode
Property the gamma rays that is projected upwards from underground near normal of detection, can more concentrate effectively reflection sensing point underground diameter about 5cm,
Depth up to uranium element in the circular cone column Rocks, Soils of nearly 1m average content, it is sensitiveer to abnormal judgement with it is accurate so that
Directive property of the invention is good；Meet detection using more photodiodes, it will be so that detector has small size, high-resolution excellent
Point；Along with the element circuit of small size makes light-weight equipment of the present invention, have structure simple, at low cost and easy to carry
The advantages of；The spectrum stabilization performance of photodiode is made using spectrum stabilization method of the invention and using the conventional power spectrum of photomultiplier tube
Instrument is in the same magnitude, about ± 0.5/DEG C.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of device of spectral measurement, including top electronics element cell (3) and lower part probe chamber, the lower part detection
Device chamber interior is packaged with main detector (1), and multiple anticoincidence detectors (2) are arranged in main detector (1) periphery, and multiple anticoincidence are visited
Surveying the design of device (2) outer layer has shielded layer (5)；
It is characterized by: shielded layer (5) the outer layer design has protective layer (7), generator is set inside the protective layer (7),
The generator output end is connect with electronics element cell (3), the generator bearing (14) and protective layer (7) front panel bottom
Two wheels (8) of face setting are fixedly connected, and rotor (13) are fixedly mounted in bearing (14) middle-end, and the rotor (13) is radial
Periphery setting magnet (15)；
The main detector (1) and anticoincidence detector (2) include scintillation crystal (10), scintillation crystal (10) the top surface patch
There is the optocoupler that shape is cone fit (11), photodiode, the photodiode point are posted in the side of optocoupler zoarium (11)
It not being connect with spectrum stabilization circuit and bias power supply circuit, the spectrum stabilization circuit includes current monitoring part and temperature sensing part,
Current monitoring part input terminal is connect with photodiode, current monitoring part output end and electronics element cell
(3) multi-channel analysis circuit connection, the temperature sensing part monitor scintillation crystal (10) temperature, temperature sensing part output end
With the multi-channel analysis circuit connection of electronics element cell (3), multi-channel analysis circuit and the bias supply electricity of electronics element cell (3)
The connection of road pressure feedback port.
2. a kind of device of spectral measurement according to claim 1, it is characterised in that: the main detector (1) is cube
Body, 4 shapes are that the anticoincidence detector (2) of cuboid is mutually spliced to form intersecting parallels structure.
3. a kind of device of spectral measurement according to claim 1, it is characterised in that: the shielded layer (5) by fine copper with
Wolfram steel or lead and wolfram steel double-layer structure form, and pull rod (9) are arranged in protective layer (7) the front panel top surface.
4. a kind of device of spectral measurement according to claim 1, it is characterised in that: the flashing of the main detector (1)
Crystal (10) uses LaBr3 ︰ Ce crystal or CsI:Tl crystal, and the scintillation crystal (10) of the anticoincidence detector (2) is using thick
Degree is the CsI:Tl crystal of 4cm.
5. a kind of device of spectral measurement according to claim 1, it is characterised in that: the light in the main detector (1)
Coupling body (11) and the input terminal of nine photodiodes are connected in parallel, and the optocoupler in the anticoincidence detector (2) is fit
(11) it is connect with the input terminal of a photodiode.
6. a kind of device of spectral measurement according to claim 5, it is characterised in that: the photodiode output end is also
It is connect with pre-amplification circuit input terminal, the number of the photodiode and of pre-amplification circuit, bias power supply circuit
Number is identical.
7. a kind of device of spectral measurement according to claim 1, it is characterised in that: the top electronics element cell
(3) top surface is equipped with handle (4), further includes that the power supply connecting with rechargeable battery output end turns inside the electronics element cell (3)
Change circuit, and the summing circuit connected by the pre-amplification circuit output end of line between plate and probe chamber, the summation
Circuit output end is connect with anticoincidence circuit, the anticoincidence circuit output end and multi-channel analysis circuit connection.
8. a kind of spectrum stabilization method of the device of spectral measurement according to claim 1, comprising the following steps:
(1) pass through the reverse leakage current of current monitoring part monitor photodiode；
(2) reverse leakage current monitored is output to multi-channel analysis circuit by current monitoring part；
(3) reverse leakage current finely tunes the output voltage of each bias power supply circuit, Mei Geguang to multi-channel analysis circuit based on the received
The input voltage changing value control reverse leakage current average value of electric diode is consistent；
(4) temperature of temperature sensing part monitoring scintillation crystal (10), and it is sent to multi-channel analysis circuit；
(5) the multi-channel analysis circuit is according to the temperature information received, and using formula: y=0.0567x-1.394 is calculated
The trim values of each bias power supply circuit output voltage, wherein y is the trim values of bias power supply circuit output voltage, and x is temperature.
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| CN1020169C (en) * | 1989-02-22 | 1993-03-24 | 成都地质学院 | Digital spectrum-stabilizing device using natural low-energy peak as reference source |
| CN1064748A (en) * | 1991-03-14 | 1992-09-23 | 成都地质学院应用核技术研究所 | Portable spectrum stabulizer of x-ray fluorometer with isotope as its source |
| CN100445734C (en) * | 2004-09-14 | 2008-12-24 | 清华大学 | Radiation imaging array solid detector |
| CN103344985A (en) * | 2013-07-11 | 2013-10-09 | 山东省科学院海洋仪器仪表研究所 | Ocean in-situ anticoincidence shielding gamma energy spectrometer |
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| CN206319881U (en) * | 2016-11-02 | 2017-07-11 | 东华理工大学 | A kind of new litho-density log system |
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